Comprehensive Analysis Of Influencing Factors And Research On Rotation Characteristics On Multipole Electromagnetic Propulsion System

Electromagnetic propulsion(EMP)is a technology which makes use of electromagnetic force to accelerate projectile to a certain velocity.This technology has several advantages,including clean energy and low cost of emission,high energy conversion efficiency,wide range of projectiles' mass.Especially,EMP technology has extensive application potential in new weapon.Currently,conventional EMPs can be divided into railgun,coilgun and reconnection gun.However,these three types of technology have their inherent defects.For example,for a railgun,it has short service life because of electrical contact which can make huge loss when projectile is accelerated;for a coilgun,its axial thrust force is much smaller than the radial compressive force,which make projectile to be deformed due to compression.To solve the technical defects mentioned above and retain the advantages of existing EMP,our research group has proposed a new type of induction propulsion.There are many factors that affect the emission performance of MFEP.In order to get higher muzzle velocity and better energy conversion efficiency,the factors that affect the efficiency were analyzed.Also,as a new type of EMP,MFEP also need further study.Some characteristics need to be verified by experiment.First,this dissertation analyzed MFEP's electromagnetic properties.Then,a simulation model of MFEP was established to analyze the effects of changes in voltage,capacitance,initial position,and others factors which affect the efficiency of the propulsion system.Further,this dissertation analyzed projectile capture effect,namely,the speed reduction.A method was proposed to weaken the effect of capture from the perspective of an external circuit.The results of finite element simulation and analysis show that this method can effectively reduce the capture effect,improve the muzzle velocity and energy conversion efficiency of MFEP.Based on the configurations of the MFEP,a new single stage configurations of the MFEP was proposed.This new type can realize the linear acceleration and rotation acceleration of projectile by the Single stage driving coils.The influence of different torsion angles and different slot numbers on the launch performance of single stage MFEP was analyzed.Finally,a single stage sextupole field electromagnetic propulsion and the relevant experimental platform were designed and built.By doing experiment,this new type that can realize the linear acceleration and rotation acceleration was certificated.The experimental results and the variation of rules are in agreement with the simulation.